package com.wootion.cims.shiro.utils;

import com.auth0.jwt.JWT;
import com.auth0.jwt.JWTVerifier;
import com.auth0.jwt.algorithms.Algorithm;
import com.auth0.jwt.exceptions.JWTDecodeException;
import com.auth0.jwt.interfaces.DecodedJWT;

import java.io.UnsupportedEncodingException;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

/**
 * @Author: LanQiang
 * @Date: 2022/10/27/9:17
 * @Description: 作用xxx
 */
public class JwtUtil {
    //token有效时长
    private static final long EXPIRE = 30 * 24 * 60 * 60 * 1000L;
    //token的密钥
    private static final String SECRET = "jwt+shiro";

    public static String createToken(String id) throws UnsupportedEncodingException {
        //token过期时间
        Date date = new Date(System.currentTimeMillis() + EXPIRE);
        //jwt的header部分
        Map<String, Object> map = new HashMap<>();
        map.put("alg", "HS256");
        map.put("typ", "JWT");

        //使用jwt的api生成token
        return JWT.create()
                .withHeader(map)
                .withClaim("id", id)//私有声明
                //.withExpiresAt(date)//过期时间
                .withIssuedAt(new Date())//签发时间
                .sign(Algorithm.HMAC256(SECRET));//签名
    }

    //校验token的有效性，1、token的header和payload是否没改过；2、没有过期
    public static boolean verify(String token) {
        try {
            //解密
            JWTVerifier verifier = JWT.require(Algorithm.HMAC256(SECRET)).build();
            verifier.verify(token);
            return true;
        } catch (Exception e) {
            return false;
        }
    }


    //无需解密也可以获取token的信息
    public static String getToken(String token) {
        try {
            DecodedJWT jwt = JWT.decode(token);
            return jwt.getClaim("id").asString();
        } catch (JWTDecodeException e) {
            return e.getMessage();
        }

    }
}
